<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>三元色 - 滤色 - screen</title>
</head>

<body>


    <div class="isolate">
        <div class="circle circle-1"></div>
        <div class="circle circle-2"></div>
        <div class="circle circle-3"></div>
    </div>
    <style>
        .circle {
            width: 80px;
            height: 80px;
            border-radius: 50%;
            mix-blend-mode: screen;
            position: absolute;
        }

        .circle-1 {
            background: red;
        }

        .circle-2 {
            background: lightgreen;
            left: 40px;
        }

        .circle-3 {
            background: blue;
            left: 20px;
            top: 40px;
        }

        .isolate {
            isolation: isolate;
            /* Without isolation, the background color will be taken into account */
            position: relative;
        }
    </style>

</body>

</html>